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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H1><A NAME="HDRPROCHAP" HREF="../proguide.htm#ToC_144">Chapter 14. Data
Processing</A></H1>
<P><A NAME="PToC16" HREF="../proguide.htm#ToC">Partial Table-of-Contents</A>
<MENU>
<LI><A NAME="PToC_145" HREF="#HDRPTTG">14.1 Data Partitioning</A>
<LI><A NAME="PToC_146" HREF="progu067.htm#HDRINADMG">14.2 Interpolation and
Mapping</A>
<LI><A NAME="PToC_147" HREF="progu068.htm#HDRINVDATA">14.3 Invalid Data</A>
<MENU>
<LI><A NAME="PToC_148" HREF="progu068.htm#HDRUN9">Examples</A>
</MENU>
<LI><A NAME="PToC_149" HREF="progu069.htm#HDRGNS">14.4 Growing and Shrinking
Partitioned Data</A>
<LI><A NAME="PToC_150" HREF="progu070.htm#HDRHASH">14.5 Hashing</A>
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<LI><A NAME="PToC_151" HREF="progu070.htm#HDRUN10">Examples</A>
</MENU>
<LI><A NAME="PToC_152" HREF="progu071.htm#HDRPIES">14.6 Pick-Assistance
Routines</A>
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<LI><A NAME="PToC_153" HREF="progu071.htm#HDRUN99">Example</A>
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<P>
The higher-level processing functions available in Data Explorer include:
data partitioning, interpolation and mapping, invalid-data
handling, growing and shrinking partitioned data,
hashing, and picking.
<P>
<HR>
<H2><A NAME="HDRPTTG" HREF="#PToC_145">14.1 Data Partitioning</A></H2>
<A NAME="IDX1064"></A>
<A NAME="IDX1065"></A>
<P>
Partitioning is the process of dividing a Field into spatially disjoint
subsets called "partitions."
The result is a <I>Composite Field</I>, whose members are
partitions.
Partitioning is particularly useful for parallel processing.
<P>
Since each interpolation element of an input Field is assigned to one
and only one partition, the resulting partitions cover precisely
the same region of space as the original
input Field did without overlap.
However, because the input elements cover the same region of space, the
bounding boxes of the resulting partitions may overlap.
<TABLE CELLPADDING="3">
<TR VALIGN="TOP"><TD><P><TT><STRONG>Group DXPartition()</STRONG></TT>
</TD><TD><P>Divides a Field into partitions.
See  <A HREF="progu265.htm#HDRDXPART">DXPartition</A>.
<A NAME="IDX1066"></A>
<A NAME="IDX1067"></A>
</TD></TR></TABLE>
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